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1

I have initializers config in my rails application under config/initializers/my_config.rb.

What is the difference between:

A:

module MyModule
 Config = "path/to/config.yml"
end

and:

B:

MyModule::Config = "path/to/config.yml"

Let's suppose we do some requests, change its implementation, and hit the application again. If I defined my constant the B way, I get an error:

uninitialized constant MyModule::Config

It will be resolved only when I restart my rails server. But when I do the A way, it still recognized the constant when I updated my code.

What is the importance of using the A syntax in this case?

ruby-on-rails ruby

share|improve this question

edited Mar 22 at 10:50

chumakoff

4,13911233

asked Mar 21 at 23:51

Kris MPKris MP

56811024

add a comment | 

1

I have initializers config in my rails application under config/initializers/my_config.rb.

What is the difference between:

A:

module MyModule
 Config = "path/to/config.yml"
end

and:

B:

MyModule::Config = "path/to/config.yml"

Let's suppose we do some requests, change its implementation, and hit the application again. If I defined my constant the B way, I get an error:

uninitialized constant MyModule::Config

It will be resolved only when I restart my rails server. But when I do the A way, it still recognized the constant when I updated my code.

What is the importance of using the A syntax in this case?

ruby-on-rails ruby

share|improve this question

edited Mar 22 at 10:50

chumakoff

4,13911233

asked Mar 21 at 23:51

Kris MPKris MP

56811024

add a comment | 

I have initializers config in my rails application under config/initializers/my_config.rb.

What is the difference between:

A:

module MyModule
 Config = "path/to/config.yml"
end

and:

B:

MyModule::Config = "path/to/config.yml"

Let's suppose we do some requests, change its implementation, and hit the application again. If I defined my constant the B way, I get an error:

uninitialized constant MyModule::Config

It will be resolved only when I restart my rails server. But when I do the A way, it still recognized the constant when I updated my code.

What is the importance of using the A syntax in this case?

ruby-on-rails ruby

share|improve this question

edited Mar 22 at 10:50

chumakoff

4,13911233

asked Mar 21 at 23:51

Kris MPKris MP

56811024

module MyModule
 Config = "path/to/config.yml"
end

MyModule::Config = "path/to/config.yml"

uninitialized constant MyModule::Config

share|improve this question

edited Mar 22 at 10:50

chumakoff

4,13911233

asked Mar 21 at 23:51

Kris MPKris MP

56811024

share|improve this question

edited Mar 22 at 10:50

chumakoff

4,13911233

asked Mar 21 at 23:51

Kris MPKris MP

56811024

edited Mar 22 at 10:50

chumakoff

4,13911233

edited Mar 22 at 10:50

chumakoff

4,13911233

asked Mar 21 at 23:51

Kris MPKris MP

56811024

asked Mar 21 at 23:51

Kris MPKris MP

56811024

2 Answers
2

active

oldest

votes

1

Part of this seems to have to do with rails hot code reloading, which has a bunch of caveats. If you aren't using hot code reloading, A and B are more equivalent, as long as MyModule has been defined first.

However, when code is reloaded, (particularly the file that defines MyModule), it might end up overwriting the existing module, and not running the B line.

The main difference though, is that A doesn't rely on how the order of other code in the project is loaded/run, but B must be run after certain code.

share|improve this answer

answered Mar 22 at 0:04

Garrett MotznerGarrett Motzner

823315

add a comment | 

0

The differences is that code A raises a syntax error, while code B is grammatical. Code B will raise a name error for MyModule unless it is previously defined, though.

share|improve this answer

answered Mar 22 at 7:33

sawasawa

1

add a comment | 

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1

Part of this seems to have to do with rails hot code reloading, which has a bunch of caveats. If you aren't using hot code reloading, A and B are more equivalent, as long as MyModule has been defined first.

However, when code is reloaded, (particularly the file that defines MyModule), it might end up overwriting the existing module, and not running the B line.

The main difference though, is that A doesn't rely on how the order of other code in the project is loaded/run, but B must be run after certain code.

share|improve this answer

answered Mar 22 at 0:04

Garrett MotznerGarrett Motzner

823315

add a comment | 

1

Part of this seems to have to do with rails hot code reloading, which has a bunch of caveats. If you aren't using hot code reloading, A and B are more equivalent, as long as MyModule has been defined first.

However, when code is reloaded, (particularly the file that defines MyModule), it might end up overwriting the existing module, and not running the B line.

The main difference though, is that A doesn't rely on how the order of other code in the project is loaded/run, but B must be run after certain code.

share|improve this answer

answered Mar 22 at 0:04

Garrett MotznerGarrett Motzner

823315

add a comment | 

Part of this seems to have to do with rails hot code reloading, which has a bunch of caveats. If you aren't using hot code reloading, A and B are more equivalent, as long as MyModule has been defined first.

However, when code is reloaded, (particularly the file that defines MyModule), it might end up overwriting the existing module, and not running the B line.

The main difference though, is that A doesn't rely on how the order of other code in the project is loaded/run, but B must be run after certain code.

share|improve this answer

answered Mar 22 at 0:04

Garrett MotznerGarrett Motzner

823315

share|improve this answer

answered Mar 22 at 0:04

Garrett MotznerGarrett Motzner

823315

answered Mar 22 at 0:04

Garrett MotznerGarrett Motzner

823315

answered Mar 22 at 0:04

Garrett MotznerGarrett Motzner

823315

0

The differences is that code A raises a syntax error, while code B is grammatical. Code B will raise a name error for MyModule unless it is previously defined, though.

share|improve this answer

answered Mar 22 at 7:33

sawasawa

1

add a comment | 

0

The differences is that code A raises a syntax error, while code B is grammatical. Code B will raise a name error for MyModule unless it is previously defined, though.

share|improve this answer

answered Mar 22 at 7:33

sawasawa

1

add a comment | 

The differences is that code A raises a syntax error, while code B is grammatical. Code B will raise a name error for MyModule unless it is previously defined, though.

share|improve this answer

answered Mar 22 at 7:33

sawasawa

1

share|improve this answer

answered Mar 22 at 7:33

sawasawa

1

answered Mar 22 at 7:33

sawasawa

1

answered Mar 22 at 7:33

sawasawa

1